linux-kernel - Re: [ 11/37] sched/nohz: Rewrite and fix load-avg computation -- again

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Message-ID: <1342805139.2583.46.camel@twins>
Date:	Fri, 20 Jul 2012 19:25:39 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Jonathan Nieder <jrnieder@...il.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Ingo Molnar <mingo@...nel.org>,
	Doug Smythies <dsmythies@...us.net>
Subject: Re: [ 11/37] sched/nohz: Rewrite and fix load-avg computation --
 again

On Fri, 2012-07-20 at 12:13 -0500, Jonathan Nieder wrote:
> Peter Zijlstra wrote:
> > On Tue, 2012-07-17 at 19:16 -0500, Jonathan Nieder wrote:
> 
> >> I'm thrilled to see this regression fix for stable@, but are we really
> >> really sure that it won't cause new regressions? 
> >
> > Doug Smythies ran a ~68 hour test on it, running various synthetic loads
> > of various frequencies against it and comparing the reported load
> > averages against the expected values and found it to be 'good'.
> >
> > This doesn't guarantee we won't find more 'interesting' problems in
> > there, but it does give me fair confidence in it.
> 
> Yeah, that sounds good.  Very nice to hear.
> 
> Is the code to generate the synthetic loads and expected results
> somewhere easy to find (like LTP or tools/testing) to make it easier
> to keep this code working well in the future?

/me finds Doug isn't actually on the CC, /me fixes.

Doug had this web-page with all his testing activities, graphs and code
etc..

  http://www.smythies.com/~doug/network/load_average/

Seems to still work.

Last time I tried his scripts they weren't very user friendly, and afaik
he's making the pretty graphs 'manually'. But whatever he's got is there
I think.

If someone wants to take it and make it pretty and 'usable' for people
in a hurry I'm sure Doug wouldn't mind.
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